The light keeps flickering. Just often enough to notice, but not quite often enough to actually do something about it.
So every evening you look at it for a second. And then look away again. Maybe it is just the bulb. Maybe the dimmer. Maybe it only happens when the washing machine is running. Often, the cause really is something small. But if several lights flicker at the same time, or you notice heat, crackling or a burning smell, it is worth investigating further.
Jump to:
Quick answer: what does a flickering light usually mean?
Flickering lights are often caused by something relatively simple. For example, an LED bulb that does not work properly with the dimmer, a bulb that is loose in the fitting or a dimmer that is no longer working correctly.
If only one bulb is flickering, start with the bulb itself. If several lights connected to the same dimmer are flickering, the bulb-dimmer combination is a likely cause. If lights are flickering in several rooms or throughout the house, the problem may be further back in the electrical installation.
If the dimmer turns out to be the cause, you can use Zoofy to have a dimmer installed by an electrician.
Do you smell burning, hear crackling or notice that a switch, dimmer or socket is getting hot? Stop investigating and have an electrician take a look.
How can you tell where the problem is?
Not every flickering light points to the same problem. Which lights are flickering and when it happens can tell you a lot.
Only one bulb is flickering: the problem is probably with the bulb, fitting or light fixture.
The light mainly flickers when the dimmer is set low: the LED bulb and dimmer may not be compatible.
Several bulbs on the same dimmer flicker: look at the dimmer or its connection.
The lights briefly dim when the oven, washing machine or dryer switches on: the appliance is drawing a lot of power or the circuit is heavily loaded.
Several lights on the same circuit flicker: there may be a poor connection or another electrical problem on that circuit.
Lights flicker throughout the house: the consumer unit, main connection or electricity network may be involved.
You hear buzzing, ticking or crackling: have it checked.
A switch, dimmer or socket gets hot: stop using it and call an electrician.
A useful rule of thumb: the more lights that flicker at the same time, the less likely it is that the bulb itself is the only problem.
What are the 7 possible causes of flickering lights?
1. The bulb is loose or needs replacing
The simplest cause is also the best place to start. A bulb may not be sitting properly in the fitting or may have developed an internal fault. With LED lighting, a failing bulb can sometimes start flickering before it stops working completely.
You can recognise this because: only one bulb flickers while the others work normally.
What can you do? Switch the light off, let the bulb cool down and make sure it is firmly fitted. You can also try another bulb that you know works properly.
2. The LED bulb and dimmer are not compatible
A common combination: modern LED bulbs connected to an older dimmer. Many older dimmers were designed for incandescent or halogen bulbs. LED lighting uses much less power, and not every dimmer can handle that properly.
The result can be flickering, buzzing or lights that become unstable at lower dimmer settings.
You can recognise this because: the flickering becomes less noticeable or disappears when you turn the dimmer up.
First check whether the LED bulb is actually dimmable. If it is and the problem continues, the dimmer itself may not be suitable for the lighting.
Have a suitable dimmer installed »
3. The dimmer is worn out or faulty
A dimmer can also wear out or fail. The lights may start behaving unpredictably, flicker while dimming, briefly switch off or flicker when you first turn them on.
You can recognise this because: several bulbs connected to the same dimmer behave in the same way, the dimmer no longer responds smoothly or it becomes unusually warm.
An electrician can check whether the dimmer is actually the cause and replace it with one that is suitable for the type and power of your lighting.
Through Zoofy, you can specifically book the Dimmer installation service.
4. A high-power appliance switches on
Do the lights briefly become dimmer when the oven, washing machine, dryer, induction hob or another high-power appliance switches on? The appliance may briefly affect the voltage in the installation when it starts.
You can recognise this because: the flickering or dip happens at exactly the same time as the appliance switches on.
If this happens regularly or other appliances also behave strangely, have the circuits checked. In some cases, appliances need to be distributed differently or an additional circuit may be required.
5. A loose or poor electrical connection
A wire or connection may not be properly secured somewhere in the installation. This could be at the light fixture, behind a switch or elsewhere in the circuit. The electrical contact may then repeatedly break and reconnect.
You can recognise this because: several lights flicker together, the problem appears randomly or you also notice ticking, crackling, heat or an unusual smell.
Do not open electrical fittings yourself to investigate this. Have an electrician inspect the connection or, for example, repair a faulty switch.
6. A problem in the consumer unit or electrical installation
Are lights flickering on several different circuits? Then the cause may be further back in the electrical system. For example, there may be a poor connection in the consumer unit or another issue with the power supply.
If a circuit breaker or RCD also keeps tripping, have the electrical installation inspected.
7. The problem is outside your home
Sometimes there is nothing wrong with your bulbs or electrical installation at all. Roadworks, a local outage or voltage fluctuations on the electricity network can also cause lights to flicker.
Simple check: ask your neighbours whether they are experiencing the same thing. If several homes have the problem at the same time, check whether your network operator has reported an outage.
How can you check the cause yourself?
You do not need to remove a switch from the wall to learn a lot about the problem. In fact, it is better if you do not.
Check how many lights are flickering. One bulb, several bulbs on one dimmer, one room or the entire house?
Try another bulb. Switch the light off and replace the bulb with one you know works correctly.
Test the dimmer. Turn it all the way up. If the flickering stops, the bulb-dimmer combination is a likely cause.
Check the bulb. Does the packaging or bulb say that it is dimmable? Not every LED bulb can be used with a dimmer.
Pay attention to when it happens. Does it happen exactly when the oven, washing machine, dryer or another appliance switches on?
Use your nose and ears. Do you hear crackling or smell something burning? Stop testing.
Ask your neighbours. If their lights are flickering too, the cause may be outside your home.
Do not: open switches, dimmers, sockets, junction boxes or the consumer unit just to "have a look". At that point, you are no longer checking the problem. You are working on the electrical installation.
Does the flickering disappear when the dimmer is turned all the way up? Then it makes sense to have the bulb-dimmer combination checked first. If the dimmer is unsuitable or faulty, you can use Zoofy to have a new dimmer installed.
Still cannot work out where the flickering is coming from? An electrician can inspect the installation. That is usually more useful than randomly replacing bulbs, dimmers and other components.
What should you do now?
Only one bulb is flickering?
Switch the light off and try another bulb first. Problem gone? Good. That was probably it.
Does the light mainly flicker while dimming?
Turn the dimmer all the way up. Does the flickering stop? Check whether the LED bulb is dimmable. If it is, the dimmer itself may not be suitable for the bulb.
In that case, you can have an electrician install a suitable dimmer.
Does the problem keep coming back?
Make a note of which lights flicker and when it happens. Also pay attention to high-power appliances switching on at the same time.
Does something get hot, smell burnt or make a crackling sound?
Stop using the relevant part of the installation. If you can safely identify the correct circuit, switch that circuit off. Do not start searching for a loose wire yourself. Have the installation inspected instead.
Should you fix flickering lights yourself or call an electrician?
These are things you can safely check yourself
Make sure a bulb is fitted properly.
Replace a faulty bulb.
Check whether an LED bulb is dimmable.
Turn the dimmer up to see whether the flickering stops.
Keep track of when the problem occurs.
Ask your neighbours whether they are experiencing the same problem.
When does it become too complicated?
As soon as the solution involves opening a dimmer, switch, socket or other fixed electrical wiring, the simple DIY part is over.
A flickering light seems like a small problem.
A connection that is just slightly loose seems small too.
Until it starts getting hot.
At that point, you want someone who knows exactly what they are doing.
What should you leave to an electrician?
An electrician can measure where the electrical instability starts, check whether the dimmer is compatible with the lighting, inspect connections and determine whether a circuit is overloaded. That way, the cause is identified before anything is replaced.
If it is clear that the dimmer needs to be replaced or reconnected, you do not need to book a general electrical job. You can directly choose Dimmer installation.
When should you call an electrician quickly?
Flickering lights do not automatically mean that something dangerous is happening. But some combinations are not something you should keep ignoring.
Have the installation checked quickly if:
you smell burning or scorching;
a dimmer, switch or socket becomes noticeably hot;
you see sparks or hear crackling;
a circuit breaker or RCD repeatedly trips;
lights in several different rooms flicker at the same time;
appliances reset, switch off or behave strangely at the same time;
the problem returns after an earlier repair.
Does a circuit keep tripping? Read more about what to do in case of a short circuit or electrical fault.
Which professional do you need for flickering lights?
In most cases where the problem goes beyond the bulb itself, you need an electrician. Which job you book depends on what you discover while checking the problem.
LED bulb and dimmer do not work well together: have an electrician check which dimmer is suitable and install the dimmer.
The dimmer is faulty or worn out: have the dimmer replaced or installed.
A switch or connection is causing problems: call an electrician for inspection or switch repair.
Several lights or circuits are flickering: have an electrician test the electrical installation.
A circuit breaker or RCD keeps tripping: call an electrician.
Your neighbours have the same problem at the same time: first check whether there is an outage with the network operator.
Only one appliance still has problems after the electrical installation has been checked: you may need a repair specialist for that appliance, such as a white goods repair technician.
How does an electrician fix flickering lights?
An electrician will not necessarily start replacing parts straight away. First, they need to find out where the problem starts.
Identify the pattern. Which lights flicker? When does it happen? Is a dimmer or appliance involved?
Measure and inspect. The electrician checks the voltage and inspects the relevant bulb, dimmer, switch, connection and circuit.
Fix the cause. A faulty part is replaced, a poor connection repaired or the electrical load adjusted.
Test again. The electrician then checks whether the lights remain stable at different dimmer settings and while relevant appliances are running.
What happens if the dimmer is the cause?
If the inspection shows that the dimmer is unsuitable for the LED bulbs or is no longer working correctly, the electrician can remove the existing switch or dimmer and install a suitable replacement.
The power is switched off, the new dimmer is connected and fitted into the wall box. The power is then restored and the electrician checks whether the light switches on, switches off and dims correctly.
View Dimmer installation via Zoofy »
What do customers say about flickering lights and dimmers?
In practice, flickering lights are not always caused by the bulb itself. Customer experiences show that dimmers, wiring and electrical connections can all come into the picture once an electrician starts investigating.
The customer insights below are based on real jobs completed through Zoofy by professionals from our network.
An electrician may be able to repair the existing dimmer connection
The Zoofy Dimmer installation service is currently rated 4.7 out of 5.
★★★★★
“Quick response to my request. Friendly gentleman who managed to get the wiring for the dimmer working again. I would hire him again next time.”
A dimmer problem does not automatically mean that everything needs replacing. Sometimes the problem is in the wiring or connection, and an electrician can get the existing setup working properly again.
Sometimes the expected solution is not needed at all
★★★★★
“Ali and his trainee arrived right on time, neatly replaced the hob and repaired the flickering lights. Afterwards, the amount was adjusted because the additional circuit in the consumer unit turned out not to be necessary for the hob. I would definitely recommend Ali.”
This shows why investigating first can be smarter than immediately replacing or adding parts.
The flickering lights were fixed, while the additional circuit that was initially thought to be necessary turned out not to be needed.
So with flickering lights, the rule is: first identify where the problem actually is, then decide what needs to be changed.
After replacing a dimmer, check whether the flickering is really gone
★★★★☆
“Both jobs were completed. One involved replacing a ceiling fan in my bathroom, and the other replacing a dimmer switch for a ceiling light in my living room. With the latter, there is still a small hesitation or flicker when switching on the light. After that, it does stay on steadily.”
A new dimmer does not automatically mean that every issue with the lighting has disappeared.
If the light still flickers or hesitates when you switch it on, mention it straight away. The electrician may need to look further at the combination of bulb and dimmer, the connection or another part of the installation.
Installing a light is only finished when the light works properly
★★☆☆☆
“Job completed, but the light was left loose at the ceiling again. And the light flickers. Shame.”
Less positive experiences can be useful too. This review shows that simply mounting a light is not enough. After installation, it should also be checked that the light is securely fitted and works properly.
If a newly connected light immediately starts flickering, mention it straight away. The cause may be the bulb, but it could also be the connection, dimmer or combination of components.
What should you tell the electrician in advance?
The more information the electrician has beforehand, the easier it is to investigate the problem efficiently. When booking, try to explain:
How many lights are flickering. One bulb, several bulbs on the same dimmer, one room or throughout the house.
When it happens. Continuously, only when switching the light on or mainly when the dimmer is set low.
Whether there is a dimmer. If possible, mention the type of bulb and dimmer.
Whether the bulbs are dimmable. This is especially important with LED lighting.
Whether anything has recently changed. For example, new LED bulbs, a new dimmer, renovation work or a new electrical appliance.
Whether other appliances affect the lights. For example, if the lights dip when the oven, washing machine or hob switches on.
Whether you notice any other warning signs. Such as buzzing, crackling, heat, a burning smell or a circuit breaker that trips.
Most importantly, describe what you actually see, even if you do not know the cause.
“The light flickers when I dim it” is often more useful to an electrician than “I think I need a new dimmer.”
Finding the cause comes before choosing the solution.
What happens if you do nothing?
That depends entirely on the cause.
If only the bulb is faulty, it will probably just become increasingly annoying and eventually stop working altogether.
If the LED bulb and dimmer are incompatible, the lighting will probably continue flickering or dimming poorly until you change the bulb, dimmer or combination.
But if there is a poor connection, faulty dimmer or another problem in the electrical installation, you do not want to ignore it for months. A poor electrical connection can become hot and other components can become damaged.
No need to panic every time a bulb flickers once.
But there is also no reason to make recurring flickering part of the interior.
How can you prevent flickering lights?
Only use dimmable LED bulbs when connecting them to a dimmer.
Check whether the bulb and dimmer are actually compatible.
If you replace old incandescent or halogen bulbs with LED bulbs, also check whether the existing dimmer is suitable for LED lighting.
If necessary, have a suitable LED dimmer installed.
Have recurring voltage issues or tripping circuits investigated.
Have new switches, light fixtures and fixed electrical connections installed correctly.
Pay attention to early warning signs such as buzzing, heat, crackling or lights that start flickering more frequently.
Frequently asked questions about flickering lights
Why are my LED lights flickering?
A common cause is the combination of LED bulb and dimmer. The bulb may not be dimmable, or the dimmer may not be suitable for the low power consumption of LED lighting. Try turning the dimmer all the way up. If the flickering stops, that combination is a likely cause.
Why does my LED light only flicker when dimmed?
An incompatible combination of bulb and dimmer is a likely cause. First check whether the bulb is dimmable. If it is and the problem continues, an electrician can check whether the dimmer is suitable and, if necessary, install a different dimmer.
How much does it cost to have a dimmer installed?
The Zoofy page for Dimmer installation currently shows a price from €69 including VAT. The final cost can depend on the situation and any additional work required. Always check the current price on the Dimmer installation page.
Are flickering lights dangerous?
Not always. A single faulty bulb is usually mainly annoying. Flickering caused by a poor electrical connection can become a safety risk, especially if you also notice heat, a burning smell, discolouration, crackling or tripping circuits.
Why do the lights dim when the washing machine or oven switches on?
A high-power appliance draws extra power when it starts. A brief dip can happen. If it occurs frequently, lasts longer or other appliances also behave strangely, have the electrical installation and circuit distribution checked.
Can I replace a dimmer myself?
Replacing a dimmer means working on fixed electrical wiring. That goes beyond the safe checks described in this article. If you are not completely sure how the installation is configured, have an electrician install the dimmer.
Can flickering lights be caused by the electricity network?
Yes. If your neighbours have the same problem at the same time, there may be an outage or voltage issue on the electricity network. If your neighbours have no problems and lights are flickering in several rooms in your home, have your own installation checked first.
My light is flickering and an appliance is switching off. Could the two be connected?
Possibly, especially if both happen at the same time. If in doubt, have the electrical installation checked first. If the power supply is fine and only the appliance continues to have problems, you may need a repair technician such as a white goods repair technician.
Have flickering lights checked through Zoofy
You changed the bulb.
Turned the dimmer all the way up.
Even asked the neighbours.
And it is still flickering.
If the dimmer seems to be the likely cause, you can use Zoofy to have a dimmer installed. An electrician checks the connection, installs the dimmer and tests whether the lighting works properly afterwards.
Still not sure where the problem is? Book an electrician to investigate the cause.
Then the light just stays on.
Even when you dim it.
Exactly as it should.
Sorted.
My name is Wilm, a construction and home improvement expert at Zoofy, with many years of experience in the construction and renovation sector. Over the years, I have supervised countless projects, ranging from small maintenance jobs to full-scale renovations. This hands-on experience has taught me how essential transparency in pricing and quality is for every project.
At Zoofy, I share my knowledge about construction costs, pricing, and smartly comparing jobs. Whether it’s the cost of a painter, a plumber’s hourly rate, or the price of a complete bathroom renovation, I help you understand what a fair price is and what to look out for.
My goal is to make home improvement projects more transparent, so everyone knows where their money goes. By combining up-to-date pricing information with real-world experience, I make it easier to find the right professional—without any surprises afterward.